The bending deformation of bimodulous rectangular cross-section beam is studied by using the semi-inverse method of elastic theory.The expressions of stress and displacement of bimodulous simply supported rectangular cross-section beam under concentrated load are derived.The analysis shows that the expressions of axial displacement and bending deflection in tension and compression zones of bimodulous simply supported rectangular cross-section beam under concentrated load are given by elastic theory.This shows that the bending deflection at any point of the bimodulous beam section is different.However,the material mechanics method can only derive the expression of the neutral axial deflection curve of a bimodulous simply supported rectangular cross-section beam under concentrated load.The bending deflection at the neutral axis of a bimodulous simply supported rectangular cross-section beam is sensitive to the change of the equivalent modulus ratio.In principle,the elastic theory is suggested to be used to calculate the bending deflection at the neutral axis of a bimodulous simply supported rectangular cross-section beam.
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